Comprehensive utilization system for high temperature furnace gas of sealed calcium carbide furnace

Abstract

The invention discloses a system for comprehensive utilization of the high-temperature furnace gas in a hermetic calcium carbide furnace. Two inlets of the hermetic calcium carbide furnace are respectively connected with a dual-drum limekiln for supplying calcium oxide and a dryer for supplying coke. One outlet of the calcium carbide furnace is connected with a grinding machine used for grinding the calcium carbide; the inlet and the outlet of a mechanical air cooling device are respectively connected with another outlet of the calcium carbide furnace and an inlet of a high-temperature furnace gas purifying device; two outlets of the high-temperature furnace gas purifying device are respectively connected with an inlet of the dual-drum limekiln and an ash content ball press; and the dual-drum limekiln is connected with an inlet of the dryer. The high-temperature furnace gas purifying device in the system takes a foaming aluminum silicate fiber material as a filtration medium which resists high temperature and corrosion and has small resistance and high separative efficiency. The whole system has good energy-saving and environment-friendly characteristics. On the one hand, the recycle of the high-temperature CO furnace gas in the hermetic calcium carbide furnace and the kiln gas of CO2 in the limekiln can satisfy the energy need of the system; on the other hand, the coke consumption and the CO2 emission are reduced.

Description

technical field [0001] The invention relates to high-temperature furnace gas recycling technology, in particular to a comprehensive utilization system of high-temperature furnace gas in a closed calcium carbide furnace. Background technique [0002] Calcium carbide is a basic organic chemical raw material, known as the mother of organic synthesis. Acetylene produced from it can replace petroleum products to produce a series of thousands of organic products such as acetic acid, vinyl acetate, polyvinyl chloride, polyvinyl alcohol, and acetylene carbon ink. In addition, it can also produce nitrogen fertilizers, pesticides, and medicines. It is also an indispensable auxiliary material in metallurgy, mining, machinery, construction and other industries. [0003] Carbide (CaC 2 ) production mainly uses quicklime (CaO) and coke (C) as raw materials, which are produced by reaction in a calcium carbide furnace. The specific equation is: CaO+3C=CaC 2 +CO↑. During the reaction pro...

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Problems solved by technology

At present, fully-sealed calcium carbide furnaces represented by Elkem calcium carbide furnaces have appeared abroad. However, these equipments are generally expensive and consume too much power, which affects the promotion and application of sealed calcium carbide furnaces in domestic calcium carbide enterprises to a certain extent. In the environment where the society advocates energy conservation and environmental protection, and builds an intensive society, the application of sealed calcium carbide furnaces is the general trend

On the other hand, due to the high temperature of the CO-rich furnace gas produced by the calcium carbide furnace, fine and sticky dust, high tar content and easy precipitation, large changes in smoke temperature, difficult system maintenance, and unstable operation, if it cannot be properly purified to obtain clean , stable gas source, then it cannot be used as fuel for gas-fired lime kilns, and can only be directly discharged after simple treatment by flue gas treatment equipment, resulting in a large amount of available CO furnace gas resources being wasted in vain, so furnace gas purification technology It is the key to restrict the comprehensive utilization of calcium carbide furnace gas

At present, foreign calcium carbide furnace gas purification mainly adopts the bag filter method of Norwegian company Elkem, but this method is sensitive to temperature, generally only applicable in the temperature range of 250-280 ℃, if the temperature is too high, the bag will burn, and the temperature is too low It will also cause the bag to be stuck due to the precipitation of coal tar, which will eventually cause the system to fail to operate. At the same time, the filtration resistance is large and the power consumption is large.

There are also domestic attempts to use porous ceramics and stainless steel screens as filter media to purify the high-temperature furnace gas of calcium carbide furnaces, but all of them fail due to long-term operation in high-temperature environments, resulting in ceramic embrittlement and steel wire carbonization.

At the same time, the sealing problem of the high-temperature gas filter is also the key to the development of this equipment. The conventional rubber gasket seal cannot be used due to high temperature softening, and the ball valve ash unloading device that is widely used in the industry is also unusable because the dust is fine and easy to get stuck and block the pipeline.

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